diff --git a/infra/fast-time/class-v3.mjs b/infra/fast-time/class-v3.mjs
index 69fd8f685..ca0af9df9 100644
--- a/infra/fast-time/class-v3.mjs
+++ b/infra/fast-time/class-v3.mjs
@@ -94,13 +94,14 @@ async function stopAll() {
   for (const p of started) { try { p.kill('SIGKILL'); } catch { } }
 }
 process.on('SIGINT', async () => { await stopAll(); process.exit(130); });
+process.on('unhandledRejection', async (e) => { log(`FAILED: ${e?.stack || e}`); await stopAll(); process.exit(3); });   // a thrown start leaves no node behind
 const minerLog = (i) => { try { return readFileSync(`${TMP}/cpu${i}.log`, 'utf8').split('\n'); } catch { return []; } };
 
 const t0 = Date.now();
 const since = () => ((Date.now() - t0) / 1000).toFixed(1);
 const n0 = await new Node(0).start();
 const n1 = await new Node(1, [`127.0.0.1:${n0.p2pPort}`]).start();
-const n2 = await new Node(2, [`127.0.0.1:${n0.p2pPort}`, `127.0.0.1:${n1.p2pPort}`]).start();
+const n2 = await new Node(2, [`127.0.0.1:${n0.p2pPort}`]).start();   // --connect takes one address
 const nodes = [n0, n1, n2];
 for (const n of nodes) {
   const line = n.grepLog(/Program class v3 from the override file/)[0];